Mexican immigrants will move for low-skill jobs. No one else will.
Recessions are a big shake-up for the economy. Some places gain jobs, and other places lose them, and so people often have to move in search of opportunity. What economists Brian Cadena and Brian Kovak found is that among low-skilled workers (those with a high-school degree or less), Mexican-born immigrants are unique in that they moved quite a bit in search of jobs during the last recession. Native-born low-skilled workers, in contrast, tended to stay in one place regardless of how the local economy was doing.
The researchers looked at 97 cities with large working populations and observed that cities with job growth among low-skill Mexican-born immigrants also saw growth in that population. Cities with job losses saw their Mexican-born immigrants move away. There was no pattern though, for the low-skill native-born, who either did not migrate or tended to migrate for family reasons.
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http://www.washingtonpost.com/news/storyline/wp/2014/08/06/mexican-immigrants-will-move-for-low-skill-jobs-no-one-else-will/